Method and apparatus for reproducing/recording at variable speeds dependent upon the bit rate of the MPEG encoded signal
AssigneeSony Corporation
InventorNaofumi Yanagihara
Life of this patent
Estimating the term…
Abstract
When a transport packet of the MPEG2 signal is recorded, a tape speed is reduced to 1/2 or 1/4 of that used to record standard data in accordance with the bit rate of the program. Two heads (A and B) having different azimuths are provided in close proximity with each other at the same height on a drum. If the 1/2 tape speed mode is selected, the recording is performed by head A during the first scan of the tape and by head B during the next scan. Even when the tape speed is a fraction of an even number of the standard tape speed, the azimuth angles of adjacent tracks are different and azimuth recording is performed to reduce crosstalk.
Claims23
A recording apparatus for recording program data including a number of programs transmitted at variable bit rates to a recording medium, comprising:
- input means for receiving said program data;
- a clock circuit for generating a reference clock;
- a time information circuit for eliminating sync data in the received program data and for adding time information to the received program data in place of the eliminated sync data, said time information being based on the generated reference clock and representing time of arrival of said program data at said input means;
- extracting means for extracting a program from said program data;
- detecting means for detecting a bit rate of the extracted program;
- selecting means for selecting one of a number of data rates as a function of the detected bit rate of said program, said number of data rates including at least a standard recording rate and 1/N times the standard recording rate where N is a positive integer;
- driving means for driving said recording medium at a transport speed corresponding to the selected data rate;
- and
- control means for controlling said selecting means and said driving means such that a plurality of recording heads having different azimuths record said program to said recording medium on adjacent tracks, thereby suppressing crosstalk on said recording medium for said program.
A reproducing apparatus for reproducing program data containing time information in place of sync data that had been eliminated from said program data, said time information being based on a reference clock and representing time when said program data had been received, said program having been transmitted for recording at variable bit rates and having been recorded on a recording medium at a data rate selected from a number of data rates as a function of a bit rate detected from the variable bit rates of the transmitted program data, said number of data rates including at least a standard recording rate and 1/N times the standard recording rate where N is a positive integer, said program data being recorded in adjacent tracks of different azimuths, said reproducing apparatus comprising:
- means for driving said recording medium at a transport speed corresponding to the selected data rate used to record said program data;
- and
- control means for controlling said means for driving such that said program data is reproduced at said variable bit rates from said adjacent tracks of different azimuths on said recording medium, thereby suppressing crosstalk during reproduction for said program data.
A recording and reproducing apparatus for recording and reproducing program data including a number of programs transmitted at variable bit rates to/from a recording medium, comprising:
- input means for receiving said program data;
- a clock circuit for generating a reference clock;
- a time information circuit for eliminating sync data in the received program data and for adding time information to the received program data in place of the eliminated sync data, said time information being based on the generated reference clock and representing time of arrival of said program data at said input means;
- extracting means for extracting a program from said program data;
- detecting means for detecting a bit rate of the extracted program;
- selecting means for selecting one of a number of data rates as a function of the detected bit rate of said program, said number of data rates including at least a standard recording rate and 1/N times the standard recording rate where N is a positive integer;
- driving means for driving said recording medium at a transport speed corresponding to the selected data rate;
- control means for controlling said selecting means and said driving means such that a plurality of heads record said program to said recording medium on adjacent tracks with different azimuths, thereby suppressing crosstalk on said recording medium;
- means for obtaining the selected data rate for reproduction of said program from said recording medium;
- and
- means for reproducing said program from said recording medium.
Dependencies are inferred from the claim text.